TEAS WG Young Lee
Haomian Zheng
Internet Draft Huawei
Intended status: Informational
Daniele Ceccarelli
Expires: February 23, 2019 Ericsson
Bin Yeong Yoon
ETRI
Oscar Gonzalez de Dios
Telefonica
Jong Yoon Shin
SKT
Sergio Belotti
Nokia
February 23, 2019
Applicability of YANG models for Abstraction and Control of Traffic
Engineered Networks
draft-ietf-teas-actn-yang-03
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Abstract
Abstraction and Control of TE Networks (ACTN) refers to the set of
virtual network operations needed to orchestrate, control and manage
large-scale multi-domain TE networks, so as to facilitate network
programmability, automation, efficient resource sharing, and end-to-
end virtual service aware connectivity and network function
virtualization services.
This document explains how the different types of YANG models
defined in the Operations and Management Area and in the Routing
Area are applicable to the ACTN framework. This document also shows
how the ACTN architecture can be satisfied using classes of data
model that have already been defined, and discusses the
applicability of specific data models that are under development. It
also highlights where new data models may need to be developed.
Table of Contents
1. Introduction ................................................ 3
2. Abstraction and Control of TE Networks (ACTN) Architecture .. 3
3. Service Models .............................................. 5
4. Service Model Mapping to ACTN ............................... 7
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4.1. Customer Service Models in the ACTN Architecture (CMI).. 7
4.2. Service Delivery Models in ACTN Architecture ........... 8
4.3. Network Configuration Models in ACTN Architecture (MPI). 8
4.4. Device Models in ACTN Architecture (SBI) ............... 9
5. Examples of Using Different Types of YANG Models ........... 10
5.1. Topology Collection ................................... 10
5.2. Connectivity over Two Nodes ........................... 10
5.3. VN service example .................................... 11
5.4. Data Center-Interconnection Example ................... 12
5.4.1. CMI (CNC-MDSC Interface) ......................... 14
5.4.2. MPI (MDSC-PNC Interface) ......................... 14
5.4.3. SBI (Southbound interface between PNC and devices) 14
6. Security ................................................... 15
7. Acknowledgements ........................................... 15
8. References ................................................. 15
8.1. Informative References................................. 15
9. Contributors ............................................... 17
Authors' Addresses ............................................ 18
1. Introduction
Abstraction and Control of TE Networks (ACTN) describes a method for
operating a Traffic Engineered (TE) network (such as an MPLS-TE
network or a layer 1 transport network) to provide connectivity and
virtual network services for customers of the TE network. The
services provided can be tuned to meet the requirements (such as
traffic patterns, quality, and reliability) of the applications
hosted by the customers. More details about ACTN can be found in
Section 2.
Data models are a representation of objects that can be configured
or monitored within a system. Within the IETF, YANG [RFC6241] is the
language of choice for documenting data models, and YANG models have
been produced to allow configuration or modelling of a variety of
network devices, protocol instances, and network services. YANG data
models have been classified in [RFC8199] and [RFC8309].
This document shows how the ACTN architecture can be satisfied using
various classes of data model that have already been defined, and
discusses the applicability of specific data models that are under
development. It also highlights where new data models may need to be
developed.
2. Abstraction and Control of TE Networks (ACTN) Architecture
[RFC8453] describes the architecture model for ACTN including the
entities (Customer Network Controller (CNC), Multi-domain Service
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Coordinator (MDSC), and Provisioning Network Controller (PNC)) and
their interfaces.
Figure 1 depicts a high-level control and interface architecture for
ACTN and is a reproduction of Figure 3 from [RFC8453]. A number of
key ACTN interfaces exist for deployment and operation of ACTN-based
networks. These are highlighted in Figure 1 (ACTN Interfaces) below:
+--------------+ +---------------+ +--------------+
| CNC-A | | CNC-B | | CNC-C |
|(DC provider) | | (ISP) | | (MVNO) |
+--------------+ +---------------+ +--------------+
\ | /
Business \ | /
Boundary =======\========================|=========================/=======
Between \ | CMI /
Customer & ----------- | --------------
Network Provider \ | /
+-----------------------+
| MDSC |
+-----------------------+
/ | \
------------ |MPI ----------------
/ | \
+-------+ +-------+ +-------+
| PNC | | PNC | | PNC |
+-------+ +-------+ +-------+
| GMPLS / | / \
| trigger / |SBI SBI / \
-------- ----- | / \
( ) ( ) | / \
- - ( Phys. ) | / -----
( GMPLS ) ( Net ) | / ( )
( Physical ) ---- | / ( Phys. )
( Network ) ----- ----- ( Net )
- - ( ) ( ) -----
( ) ( Phys. ) ( Phys. )
-------- ( Net ) ( Net )
----- -----
Figure 1 : ACTN Interfaces
The interfaces and functions are described below (without modifying
the definitions) in [RFC8453]:
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The CNC-MDSC Interface (CMI) is an interface between a CNC and
an MDSC. This interface is used to communicate the service
request or application demand. A request will include specific
service properties, for example, services type, bandwidth and
constraint information. These constraints SHOULD be measurable
by MDSC and therefore visible to CNC via CMI. The CNC can also
request the creation of the virtual network service based on
underlying physical resources to provide network services for
the applications. The CNC can provide the end-point
information/characteristics together with traffic matrix
specifying specific customer constraints. The MDSC may also
report potential network topology availability if queried for
current capability from the Customer Network Controller.
Performance monitoring is also applicable in CMI, which enables
the MDSC to report network parameters/telemetries that may
guide the CNC to create/change their services.
The MDSC-PNC Interface (MPI) is an interface between a MDSC and
a PNC. It allows the MDSC to communicate requests to
create/delete connectivity or to modify bandwidth reservations
in the physical network. In multi-domain environments, each PNC
is responsible for a separate domain. The MDSC needs to
establish multiple MPIs, one for each PNC and perform
coordination between them to provide cross-domain connectivity.
MPI plays an important role for multi-vendor mechanism, inter-
operability can be achieved by standardized interface modules.
The South-Bound Interface (SBI) is the provisioning interface
for creating forwarding state in the physical network,
requested via the PNC. The SBI is not in the scope of ACTN,
however, it is included in this document so that it can be
compared to models in [RFC8309].
3. Service Models
[RFC8309] introduces a reference architecture to explain the nature
and usage of service YANG models in the context of service
orchestration. Figure 2 below depicts this relationship and is a
reproduction of Figure 2 from [RFC8309]. Four models depicted in
Figure 2 are defined as follows:
Customer Service Model: A customer service model is used to
describe a service as offer or delivered to a customer by a
network operator.
Service Delivery Model: A service delivery model is used by a
network operator to define and configure how a service is
provided by the network.
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Network Configuration Model: A network configuration model is
used by a network orchestrator to provide network-level
configuration model to a controller.
Device Configuration Model: A device configuration model is
used by a controller to configure physical network elements.
Customer
------------------ Service ----------
| | Model | |
| Service || Customer |
| Orchestrator | | |
| | ----------
------------------
. . -----------
. . ......|Application|
. . : | BSS/OSS |
. . : -----------
. Service Delivery . :
. Model . :
------------------ ------------------
| | | |
| Network | | Network |
| Orchestrator | | Orchestrator |
| | | |
.------------------ ------------------.
. : : .
. : Network Configuration : .
. : Model : .
------------ ------------ ------------ ------------
| | | | | | | |
| Controller | | Controller | | Controller | | Controller |
| | | | | | | |
------------ ------------ ------------ ------------
: . . : :
: . . Device : :
: . . Configuration : :
: . . Model : :
--------- --------- --------- --------- ---------
| Network | | Network | | Network | | Network | | Network |
| Element | | Element | | Element | | Element | | Element |
--------- --------- --------- --------- ---------
Figure 2: An SDN Architecture with a Service Orchestrator
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4. Service Model Mapping to ACTN
YANG models coupled with the RESTCONF/NETCONF protocol
[RFC6241][RFC8040] provides solutions for the ACTN framework. This
section explains which types of YANG models apply to each of the
ACTN interfaces.
Refer to Figure 5 of [RFC8453] for details of the mapping between
ACTN functions and service models. In summary, the following
mappings are held between and Service Yang Models in [RFC8309] and
the ACTN interfaces in [RFC8453].
o Customer Service Model CMI
o Network Configuration Model MPI
o Device Configuration Model SBI
4.1. Customer Service Models in the ACTN Architecture (CMI)
Customer Service Models, which are used between a customer and a
service orchestrator as in [RFC8309], should be used between the CNC
and MDSC (e.g., CMI) serving as providing a simple intent-like
model/interface.
Among the key functions of Customer Service Models on the CMI is the
service request. A request will include specific service properties,
including: service type and its characteristics, bandwidth,
constraint information, and end-point characteristics.
The following table provides a list of functions needed to build the
CMI. They are mapped with Customer Service Models.
Function Yang Model
-----------------------------------------------------------
VN Service Request [ACTN-VN-YANG]
VN Computation Request [ACTN-VN-YANG]*
TE & Service Mapping [TE-Service-Mapping]**
VN Performance Monitoring Telemetry [ACTN-PM-Telemetry]***
Topology Abstraction [TE-topology]****
Layer 1 Connectivity Service Model [L1CSM]
Layer 2 VPN Service Model [RFC8466]
Layer 3 VPN Service Model [RFC8299]
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*VN computation request in the CMI context means network path
computation request based on customer service connectivity request
constraints prior to the instantiation of a VN creation.
**[TE-Service-Mapping] provides a mapping and cross-references
between service models (e.g., L3SM, L2SM, L1CSM) and TE model via
[ACTN-VN-YANG] and [TE-topology]. This model can be used as either
Customer Service Models, or Service Delivery model described in
Section 4.2.
***ietf-actn-te-kpi-telemetry model in [ACTN-PM-Telemetry] describes
performance telemetry for ACTN VN model. This module also allows
autonomic traffic engineering scaling intent configuration mechanism
on the VN level. Scale in/out criteria might be used for network
autonomics in order the controller to react to a certain set of
variations in monitored parameters. Moreover, this module also
provides mechanism to define aggregated telemetry parameters as a
grouping of underlying VN level telemetry parameters.
****TE-Topology's Connectivity Matrices/Matrix construct can be used
to instantiate VN Service via a suitable referencing and mapping
with [ACTN-VN-YANG].
4.2. Service Delivery Models in ACTN Architecture
The Service Delivery Models where the service orchestration and the
network orchestration could be implemented as separate components as
seen in [RFC8309]. On the other hand, from an ACTN architecture
point of view, the service delivery model between the service
orchestrator and the network orchestrator is an internal interface
between sub-components of the MDSC in a single MDSC model.
In the MDSC hierarchical model where there are multiple MDSCs, the
interface between the top MDSC and the bottom MDSC can be mapped to
service delivery models.
4.3. Network Configuration Models in ACTN Architecture (MPI)
The Network Configuration Models is used between the network
orchestrator and the controller in [RFC8309]. In ACTN, this model is
used primarily between a MDSC and a PNC. The Network Configuration
Model can be also used for the foundation of more advanced models,
like hierarchical MDSCs (see Section 4.5)
The Network Configuration Model captures the parameters which are
network wide information.
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The following table provides a list of functions needed to build the
MPI. They are mapped with Network Configuration Yang Models. Note
that various Yang models are work in progress.
Function Yang Model
--------------------------------------------------------
Configuration Scheduling [Schedule]
Path computation [PATH_COMPUTATION-API]
Tunnel/LSP Provisioning [TE-tunnel]
Topology Abstraction [TE-topology]
Client Signal Description [Client-signal]
Service Provisioning [Client-signal]&[TE-tunnel]*
OTN Topology Abstraction [OTN-topo]
WSON Topology Abstraction [WSON-topo]
Flexi-grid Topology Abstraction [Flexi-topo]
Microwave Topology Abstraction [MW-topo]
OTN Tunnel Model [OTN-Tunnel]
WSON TE Tunnel Model [WSON-Tunnel]
Flexi-grid Tunnel Model [Flexigrid-Tunnel]
* This function is a combination of tunnel set up and client signal
description. Usually a tunnel is setting up first to get prepared to
carry a client signal, in order to do the service provisioning. Then
the client signal is adapted to the established tunnel. It is worth
noting that various tunnel models such as [OTN-Tunnel] and [WSON-
Tunnel] can be used together with the [TE-tunnel] model to construct
technology-specific tunnels, and carry different types of client
signals. More details can be found in [Client-signal].
[TE-topo-tunnel] provides the clarification and example usage for TE
topology model [TE-topology] and TE tunnel model [TE-tunnel]. [T-NBI
Applicability] provides a summary on the applicability of existing
YANG model usage in the current network configuration, especially
for transport network.
4.4. Device Models in ACTN Architecture (SBI)
Note that SBI is not in the scope of ACTN, as there is already
mature protocol solutions for various purpose on the device level of
ACTN architecture, such as RSVP-TE, OSPF-TE and so on. The
interworking of such protocols and ACTN controller hierarchies can
be found in [gmpls-controller-inter-work].
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For the device YANG models are used for per-device configuration
purpose, they can be used between the PNC and the physical
network/devices. One example of Device Models is ietf-te-device yang
module defined in [TE-tunnel].
5. Examples of Using Different Types of YANG Models
This section provides some examples on the usage of IETF YANG models
in the network operation. A few typical generic scenarios are
involved. In [T-NBI Applicability], there are more transport-related
scenarios and examples.
5.1. Topology Collection
Before any connection is requested and delivered, the controller
needs to understand the network topology. The topology information
is exchanged among controllers with topology models, such as [TE-
topology]. Moreover, technology-specific topology reporting may use
the model described in [OTN-topo] [WSON-topo], and [Flexi-topo] for
OTN, WSON and Flexi-grid, respectively. By collecting the network
topology, each controller can therefore construct a local database,
which can be used for the further service deployment.
There can be different types of abstraction applied between each
pair of controllers, corresponding method can be found in [RFC8453].
The technology-specific features may be hidden after abstraction, to
make the network easier for the user to operate.
When there is a topology change in the physical network, the PNC
should report the change to upper level of controllers via updating
messages using topology models. Accordingly, such changes is
propagated between different controllers for further
synchronization.
5.2. Connectivity over Two Nodes
The service models, such as described in [RFC8299], [RFC8466] and
[L1CSM] provide a customer service model which can be used in
provider networks.
It would be used as follows in the ACTN architecture:
A CNC uses the service models to specify the two client nodes
that are to be connected, and also indicates the amount of
traffic (i.e., the bandwidth required) and payload type. What
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may be additionally specified is the SLA that describes the
required quality and resilience of the service.
The MDSC uses the information in the request to pick the right
network (domain) and also to select the provider edge nodes
corresponding to the customer edge nodes.
If there are multiple domains, then the MDSC needs to
coordinate across domains to set up network tunnels to deliver
a service. Thus coordination includes, but is not limited to,
picking the right domain sequence to deliver a service.
Additionally, an MDSC can initiate the creation of a tunnel (or
tunnel segment) in order to fulfill the service request from
CNC based on path computation upon the overall topology
information it synthesized from different PNCs. The based model
that can cater this purpose is the TE tunnel model specified in
[TE-tunnel]. Technology-specific tunnel configuration may use
the model described in [OTN-Tunnel] [WSON-Tunnel], and
[Flexigrid-Tunnel] for OTN, WSON and Flexi-grid, respectively.
Then, the PNCs need to decide the explicit route of such a
tunnel or tunnel segment (in case of multiple domains) for each
domain, and then create such a tunnel using protocols such as
PCEP and RSVP-TE or using per-hop configuration.
5.3. VN service example
The service model defined in [ACTN-VN-YANG] describes a virtual
network (VN) as a service which is a set of multiple connectivity
services:
A CNC will request VN to the MDSC by specifying a list of VN
members. Each VN member specifies either a single connectivity
service, or a source with multiple potential destination points
in the case that the precise destination sites are to be
determined by MDSC.
o In the first case, the procedure is the same as the
connectivity service, except that in this case, there is a
list of connections requested.
o In the second case, where the CNC requests the MDSC to
select the right destination out of a list of candidates,
the MDSC needs to evaluate each candidate and then choose
the best one and reply with the chosen destination for a
given VN member. After this is selected, the connectivity
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request setup procedure is the same as in the connectivity
example in section 5.2.
After the VN is set up, a successful reply message is sent from MDSC
to CNC, indicating the VN is ready. This message can also be
achieved by using the model defined in [ACTN-VN-YANG].
5.4. Data Center-Interconnection Example
This section describes more concretely how existing YANG models
described in Section 4 map to an ACTN data center interconnection
use case. Figure 3 shows a use-case which shows service policy-
driven Data Center selection and is a reproduction of Figure A.1
from [RFC8454].
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+----------------+
| CNC |
| (Global DC |
| Operation |
| Control) |
+--------+-------+
| | VN Requirement/Policy:
CMI: | | - Endpoint/DC location info
Service model | | - Endpoint/DC dynamic
| | selection policy
| | (for VM migration, DR, LB)
| v
+---------+---------+
| Multi-domain | Service policy-driven
|Service Coordinator| dynamic DC selection
MPI: +-----+---+---+-----+
Network Configuration | | |
Model | | |
+----------------+ | +---------------+
| | |
+-----+-----+ +------+-----+ +------+-----+
| PNC for | | PNC for | | PNC for |
| Transport | | Transport | | Transport |
| Network A | | Network B | | network C |
+-----------+ +------------+ +------------+
Device | | |
Model | | |
| | |
+---+ ------ ------ ------ +---+
|DC1|--//// \\\\ //// \\\\ //// \\\\---+DC5|
+---+ | | | | | | +---+
| TN A +-----+ TN B +----+ TN C |
/ | | | | |
/ \\\\ //// / \\\\ //// \\\\ ////
+---+ ------ / ------ \ ------ \
|DC2| / \ \+---+
+---+ / \ |DC6|
+---+ \ +---+ +---+
|DC3| \|DC4|
+---+ +---+
DR: Disaster Recovery
LB: Load Balancing
Figure 3: Service Policy-driven Data Center Selection
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Figure 3 shows how VN policies from the CNC (Global Data Center
Operation) are incorporated by the MDSC to support multi-destination
applications. Multi-destination applications refer to applications
in which the selection of the destination of a network path for a
given source needs to be decided dynamically to support such
applications.
Data Center selection problems arise for VM mobility, disaster
recovery and load balancing cases. VN's policy plays an important
role for virtual network operation. Policy can be static or dynamic.
Dynamic policy for data center selection may be placed as a result
of utilization of data center resources supporting VMs. The MDSC
would then incorporate this information to meet the objective of
this application.
5.4.1. CMI (CNC-MDSC Interface)
[ACTN-VN-YANG] is used to express the definition of a VN, its VN
creation request, the service objectives (metrics, QoS parameters,
etc.), dynamic service policy when VM needs to be moved from one
Data Center to another Data Center, etc. This service model is used
between the CNC and the MDSC (CMI). The CNC in this use-case is an
external entity that wants to create a VN and operates on the VN.
5.4.2. MPI (MDSC-PNC Interface)
The Network Configuration Model is used between the MDSC and the
PNCs. Based on the Customer Service Model's request, the MDSC will
need to translate the service model into the network configuration
model to instantiate a set of multi-domain connections between the
prescribed sources and the destinations. The MDSC will also need to
dynamically interact with the CNC for dynamic policy changes
initiated by the CNC. Upon the determination of the multi-domain
connections, the MDSC will need to use the network configuration
model such as [TE-tunnel] to interact with each PNC involved on the
path. [TE-topology] is used to for the purpose of underlying domain
network abstraction from the PNC to the MDSC.
5.4.3. SBI (Southbound interface between PNC and devices)
The Device Model can be used between the PNC and its underlying
devices that are controlled by the PNC. The PNC will need to trigger
signaling using any mechanisms it employees (e.g. [RSVP-TE-YANG]) to
provision its domain path segment. There can be a plethora of
choices how to control/manage its domain network. The PNC is
responsible to abstract its domain network resources and update it
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to the MDSC. Note that this interface is not in the scope of ACTN.
This section is provided just for an illustration purpose.
6. Security
This document is an informational draft. When the models mentioned
in this draft are implemented, detailed security consideration will
be given in such work.
How security fits into the whole architecture has the following
components:
- the use of Restconf security between components
- the use of authentication and policy to govern which services can
be requested by different parties.
- how security may be requested as an element of a service and
mapped down to protocol security mechanisms as well as separation
(slicing) of physical resources)
7. Acknowledgements
We thank Adrian Farrel for providing useful comments and suggestions
for this draft.
8. References
8.1. Informative References
[RFC8309] Q. Wu, W. Liu and A. Farrel, "Service Models Explained",
RFC 8309.
[RFC8199] D. Bogdanovic, B. Claise, and C. Moberg, "YANG Module
Classification", RFC 8199.
[RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
and A. Bierman, Ed., "Network Configuration Protocol
(NETCONF)", RFC 6241.
[RFC8040] A. Bierman, M. Bjorklund, and K. Watsen, "RESTCONF
Protocol", RFC 8040.
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[RFC8453] D. Ceccarelli and Y. Lee, "Framework for Abstraction and
Control of Traffic Engineered Networks", RFC8453.
[TE-topology] X. Liu, et. al., "YANG Data Model for TE Topologies",
draft-ietf-teas-yang-te-topo, work in progress.
[TE-tunnel] T. Saad (Editor), "A YANG Data Model for Traffic
Engineering Tunnels and Interfaces", draft-ietf-teas-yang-
te, work in progress.
[ACTN-VN-YANG] Y. Lee (Editor), "A Yang Data Model for ACTN VN
Operation", draft-lee-teas-actn-vn-yang, work in progress.
[L1CSM] G. Fioccola, K. Lee, Y. Lee, D. Dhody, O. Gonzalez de-Dios,
D. Ceccarelli, "A Yang Data Model for L1 Connectivity
Service Model (L1CSM)", draft-ietf-ccamp-l1csm-yang, work
in progress.
[RFC8466] B. Wen, G. Fioccola, C. Xie, L. Jalil, "A YANG Data Model
for L2VPN Service Delivery", RFC8466.
[RFC8299] Q. Wu, S. Litkowski, L. Tomotaki, K.Ogaki, "YANG Data
Model for L3VPN Service Delivery", RFC8299.
[RFC8454] Y. Lee & S. Belotti, "Information Model for Abstraction
and Control of TE Networks (ACTN)", RFC8454.
[RSVP-TE-YANG] T. Saad (Editor), "A YANG Data Model for Resource
Reservation Protocol (RSVP)", draft-ietf-teas-yang-rsvp,
work in progress.
[Schedule] X. Liu, et. al., "A YANG Data Model for Configuration
Scheduling", draft-liu-netmod-yang-schedule, work in
progress.
[OTN-topo] H. Zheng, et. al., "A YANG Data Model for Optical
Transport Network Topology", draft-ietf-ccamp-otn-topo-
yang, work in progress.
[WSON-topo] Y. Lee, et. al., "A Yang Data Model for WSON Optical
Networks", draft-ietf-ccamp-wson-yang, work in progress.
[Flexi-topo] J.E. Lopez de Vergara, et. al., "YANG data model for
Flexi-Grid Optical Networks", draft-vergara-ccamp-flexigrid-
yang, work in progress.
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[MW-topo] M. Ye, et. al., "A YANG Data Model for Microwave
Topology", draft-ietf-ccamp-mw-topo-yang, work in
progress.
[OTN-Tunnel] H. Zheng, et. al., "OTN Tunnel YANG Model", draft-
ietf-ccamp-otn-tunnel-model, work in progress.
[ACTN-PM-Telemetry] Y. Lee, D. Dhody, S. Karunanithi, R. Vilalta, D.
King, and D. Ceccarelli, "YANG models for ACTN TE
Performance Monitoring Telemetry and Network Autonomics",
draft-lee-teas-actn-pm-telemetry-autonomics, work in
progress.
[WSON-Tunnel] Y. Lee, D. Dhody, V. Lopez, D. King, B. Yoon, and R.
Vilalta, "A Yang Data Model for WSON Tunnel", draft-ietf-
ccamp-wson-tunnel-model, work in progress.
[Flexigrid-Tunnel] J. Vergara, D. Perdices, V. Lopez, O. Gonzalez de
Dios, D. King, Y. Lee, and G. Galimberti, "YANG data model
for Flexi-Grid media-channels", draft-ietf-ccamp-
flexigrid-media-channel-yang, work in progress.
[TE-Service-Mapping] Y. Lee, et al, "Traffic Engineering and Service
Mapping Yang Model", draft-lee-teas-te-service-mapping-
yang, work in progress.
[Client-signal] H. Zheng, et al, "A YANG Data Model for Optical
Transport Network Client Signals", draft-zheng-ccamp-
client-signal-yang, work in progress.
[TE-topo-tunnel] I.Bryskin, et. al., "TE Topology and Tunnel
Modeling for Transport Networks", draft-ietf-teas-te-topo-
and-tunnel-modeling, work in progress.
[T-NBI Applicability] I. Busi, et al, "Transport Northbound
Interface Applicability Statement and Use Cases", draft-
ietf-ccamp-transport-nbi-app-statement, work in progress.
[gmpls-controller-inter-work] H. Zheng, et al, "Interworking of
GMPLS Control and Centralized Controller System", draft-
zheng-teas-gmpls-controller-inter-work, work in progress.
9. Contributors
Contributor's Addresses
Lee, et al. Expires August 23, 2019 [Page 17]
Internet-Draft ACTN YANG February 2019
Dhruv Dhody
Huawei Technologies
Email: dhruv.ietf@gmail.com
Xian Zhang
Huawei Technologies
Email: zhang.xian@huawei.com
Authors' Addresses
Young Lee
Huawei Technologies
5340 Legacy Drive
Plano, TX 75023, USA
Phone: (469)277-5838
Email: leeyoung@huawei.com
Haomian Zheng
Huawei Technologies
Email: zhenghaomian@huawei.com
Daniele Ceccarelli
Ericsson
Torshamnsgatan,48
Stockholm, Sweden
Email: daniele.ceccarelli@ericsson.com
Bin Yeong Yoon
ETRI
Email: byyun@etri.re.kr
Oscar Gonzalez de Dios
Telefonica
Lee, et al. Expires August 23, 2019 [Page 18]
Internet-Draft ACTN YANG February 2019
Email: oscar.gonzalezdedios@telefonica.com
Jong Yoon Shin
SKT
Email: jongyoon.shin@sk.com
Sergio Belotti
Nokia
Email: sergio.belotti@nokia.com
Lee, et al. Expires August 23, 2019 [Page 19]